How to manage SSH permission for custom users under your server

Sometimes it is very useful to manage/assign the SSH authentication to a particular user, Click here for SSH root permission.
There are two directives in SSH configuration file to manage the SH permission for custom users, see the directive details below:

Linux Server Administrator. I'm dealing with Linux servers since 2012. I started this blog to share and discuss my ideas with the world. Check My Profile!! in uPwork (oDesk) and let me know if you need any assistance. Thanks!!